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From:   jeff.xie@linux.dev
Message-ID: <a60cb31b7181a685c38ebfc8d7c721609c8dce0b@linux.dev>
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Subject: Re: [RFC][PATCH 4/4] mm/rmap: implement anonmap allocate post
 callback for page_owner
To:     "Matthew Wilcox" <willy@infradead.org>
Cc:     akpm@linux-foundation.org, iamjoonsoo.kim@lge.com, vbabka@suse.cz,
        cl@linux.com, penberg@kernel.org, rientjes@google.com,
        roman.gushchin@linux.dev, 42.hyeyoo@gmail.com, linux-mm@kvack.org,
        linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
        chensong_2000@189.cn, xiehuan09@gmail.com
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November 9, 2023 at 10:10 PM, "Matthew Wilcox" <willy@infradead.org> wrot=
e:


>=20
>=20On Thu, Nov 09, 2023 at 11:25:21AM +0800, Jeff Xie wrote:
>=20
>=20>=20
>=20> +static int anon_alloc_post_page_owner(struct folio *folio, struct =
task_struct *tsk,
> >  + void *data, char *kbuf, size_t count)
> >  +{
> >  + int ret;
> >  + unsigned long address =3D (unsigned long)data;
> >  +
> >  + ret =3D scnprintf(kbuf, count, "ANON_PAGE address 0x%lx\n", addres=
s);
> >=20
>=20
> ... completely ignoring that it might have been mremap() since ...
>=20
>=20I'm not an expert on anon memory. I'm sure someone can tell you how t=
o
> figure out the current address that a folio is mapped at.
>

I'm currently not sure if the address parameter is the mapped address, so=
 this is an RFC patchset ;-)

__
Jeff Xie